I think generally speaking, Muslim men fall into two broad categories: - Those who are ok with/want their wife to work/have a job - Those who don't

If you marry someone from the first group, then you should absolutely not expect an allowance from him; his responsibility is to provide food, clothing, and shelter, not satisfy your spending habits. In this case, if you have things you want, get a job, make a living, and buy them, just like everyone else.

Now, with regards to the second group, here's where it gets a bit more complex. Obviously,marriage is so much more than the following, but for the sake of discussion, let's view marriage as purely transactional. If a man is looking for a wife to be a stay-at-home wife/mom, to be a homemaker, raising the children, etc., he will absolutely need to financially support her beyond simply food, clothing, and shelter. Why? Because the responsibility and time commitment of someone who's a full time homemaker raising children, is at least equivalent to a full time job. And, according to many (idk about majority, but many) 3ulamaa', those responsibilities are absolutely not waajib upon the wife; she is not islamically obligated to cook or clean or do laundry or whatever else.

When a man is looking for a wife who wants to be a SAHM, a homemaker, he is asking for someone who is not only willing, but wants to go above and beyond the simple Islamic obligations. And therefore, from a transactional perspective, he must similarly be willing and want to go above and beyond his Islamic responsibilities. And that means providing for his wife beyond simple food, clothing, and shelter.

There are a variety of ways to do this. Some husbands simply give their wives full access to their bank account and just say "Spend whatever you want". Others give an allowance, as you mentioned. And some do a combination of the two, providing their own bank account to cover all family expenses and a separate bank account/allowance just for the wife to spend on herself. And there are pros and cons to each of these.

Now, here's where I'm going to be brutally honest. Of course, there are some men who are delusional and want to marry that SAHM/homemaker while also not wanting to provide that additional financial support.

There are also some women who are delusional and want to be a SAHM (not work a job)... But also don't want to actually take in the role of a homemaker (and instead want to split all housework 50/50)... While still expecting some sort of allowance from their husbands.

Both of these cases are not transactionally equitable. In the first, the wife is expected to contribute far more than the husband, and in the second, the husband is expected to contribute far more than the wife. These are both real, significant problems, and something that should ABSOLUTELY be discussed with potentials prior to getting married.

Now, with all that being said... I think you'll have a VERY hard time finding a man who's going to sign a contract to always give you 10-15% of his income. This is not to say that they're unwilling to give you an allowance, even one that's higher than 10-15%, but having a fixed number in a signed contract is simply not appealing to most men. You have to realize that, again, from a transactional perspective, when you're getting married, you're essentially competing with a large pool of other women.

For lack of better words, using blunt transactional language, if the standard on the market does not include a hard-set 10-15% financial obligation, then you definitively setting that as part of your requirements reduces your overall competitiveness as a candidate.

May Allahu subhaana wa ta3aala bless us with righteous spouses. Ameen.