مصروف البقالة أكثر من رسوم الاشتراك.

Because this is a nominal sentence in Arabic. In the present tense, Arabic usually does not use a separate word for is / are.

So:

• مصروف البقالة أكثر من رسوم الاشتراك
• literally: Grocery expense more than subscription fees
• natural English: The grocery expense is more than the subscription fees

If you wanted was, Arabic would normally add a verb such as كان.

This is an iḍāfa construction, often called a genitive construction or noun-noun possession structure.

مصروف البقالة means something like:

• the expense of the grocery
• more naturally, grocery expense or grocery spending

In an iḍāfa:

1. the first noun usually does not take ال
2. the second noun is in the genitive relationship
3. the whole phrase can still be definite

So:

• مصروف البقالة = the grocery expense
• not المصروف البقالة

The definiteness comes from البقالة, the second noun.

البقالة literally means the grocery store or the grocer’s shop.

But in a phrase like مصروف البقالة, it often refers more broadly to grocery spending or money spent on groceries. This is very natural in Arabic: a place noun can stand for the type of expense connected with that place.

So depending on context, English may translate it as:

• grocery expense
• groceries
• money spent at the grocery store

Arabic often uses a singular noun to talk about an expense category as a whole.

So مصروف البقالة means grocery spending / the grocery expense, not necessarily just one single item.

This is similar to English using singular mass-style expressions like:

• rent
• food expense
• travel expense

Arabic could also use a plural form in some contexts, such as مصاريف البقالة or مصروفات البقالة, but مصروف البقالة is understandable as a category of spending.

رسوم is the plural of رسم, which can mean fee, charge, or due.

In Arabic, رسوم is very commonly used even when English might use a singular expression like:

• subscription fee
• tuition
• service charge

So رسوم الاشتراك can mean:

• subscription fees
• or more generally the subscription charge

Arabic often prefers the plural here because fees are thought of as charges or dues.

Again, this is the iḍāfa structure.

• رسوم الاشتراك = subscription fees
• literally: fees of the subscription

Arabic very often links two nouns directly instead of using a preposition like for or of.

So where English says:

• subscription fee
• school fees
• car door

Arabic often uses iḍāfa:

• رسوم الاشتراك
• رسوم المدرسة
• باب السيارة

Because the phrase is treating it as a specific or established type of subscription: the subscription.

In iḍāfa, the second noun often carries the definiteness:

• رسوم اشتراك = subscription fees / fees of a subscription (less definite, more general)
• رسوم الاشتراك = the subscription fees / fees of the subscription

In many real sentences, Arabic uses the definite form where English might still sound general.

Because أكثر is used for quantity, amount, or degree: more.

Here the sentence is comparing amounts of money, so أكثر is the natural choice.

• أكثر = more
• أكبر = bigger / larger

So:

• مصروف البقالة أكثر من رسوم الاشتراك = the amount is greater
• أكبر would sound more like physical size, or a different kind of comparison

In standard Arabic, when you compare one thing directly to another with أفعل التفضيل forms like أكثر, you normally use من for than.

So:

• أكثر من = more than
• أقل من = less than
• أكبر من = bigger than

Without من, the sentence would not express this comparison properly.

Yes, it is understandable and natural. But Arabic offers several similar ways to express the same idea, depending on style.

Possible alternatives include:

• مصاريف البقالة أكثر من رسوم الاشتراك
• تكلفة البقالة أكثر من رسوم الاشتراك
• الإنفاق على البقالة أكثر من رسوم الاشتراك

The differences are small:

• مصروف = expense / spending
• مصاريف = expenses
• تكلفة = cost
• الإنفاق على = spending on

So the original sentence is fine, but it is not the only possible phrasing.

A fully vowelled version would be:

مَصْرُوفُ البَقَّالَةِ أَكْثَرُ مِنْ رُسُومِ الِاشْتِرَاكِ

A careful pronunciation would be approximately:

maṣrūfu l-baqqālati aktharu min rusūmi l-ishtirāki

A few notes:

• مصروفُ is nominative because it is the subject
• البقالةِ is genitive because it is the second part of an iḍāfa
• أكثرُ is nominative as the predicate
• رسومِ is genitive after من
• الاشتراكِ is genitive as part of the iḍāfa رسوم الاشتراك

In normal unvowelled writing, these case endings are usually not shown.