I don't really understand, when you expect a detailed reply, why aint the question clear?

Its not only the question of coming to Qatar for that salary, but your decision should entirely depend on if you are offered reasonable for your position comparatively. For example, if a labor working for who is actually supposed to earn a maximum of Qrs 1,000 / per month (as per average labor salary in Qatar) is unexpectedly offered Qrs 15,000 / per month, no wonder he'll go crazy & most willingly think of migrating to Qatar regardless the cost of living.

I guess, you should have understood my point by now. Therefore, it is important to clear out what position have you been offered & experience you hold in the same field.

Now, just to answer your question, for me personally Qrs 15,000/per month is a bit more than average if you are not looking for a very comfortable Fully Furnished Accommodation. Also, depends if you are married/accompanied with family of still single/executive bachelor.

For a single bedroom, independant flat U/F will cost you above 5000 per month. If you are bachelor, better go for a sharing, you might be lucky to get a very good bargain.

Anyways, best of luck :)