B"H
There is hardly anyone today, neither a Rabbi nor an institution, who is not after your money. Everyone needs donations and some Rabbis don't care how the money is floating in. The main issue is getting the donations no matter how and a Rabbi can be as frum as he wants but when it comes to money, some Rabbis are worse than any secular Jew. However, they still justify their actions with keeping up their services and institution.
When I go somewhere today, first of all I make it clear that I don't have much money. Even if it is not always the case. However, as soon as you signalize that you may have a few hundred Shekels in your pocket, someone asks you for a donation. For instance: A few weeks ago, I went to a Shiur. A pretty boring one, I have to say and I worked really hard not to fall asleep. At the end of the lecture, the Rabbi told us a story about receiving a letter by mistake where someone is asking for donations in order to get a new Torah scroll written.
I didn't really get it but the Shiur Rabbi somehow took it upon himself to also collect for the new scroll and asked us Shiur participants for a 20 Shekel (approx. 6 Dollar) donation. To be very honest: I didn't believe a word and I am still convinced that the Rabbi wanted the money for himself. Nevertheless, all of us (at least four people) gave him the 20 Shekels and he stressed that now we have the big S'chut (merit) to own an Ot (letter) in a new Torah scroll.
Halacha says that although we may have given a "wrong" donation (where the person is using the money for himself), we still earned the merit and the Mitzvah is ours. On the other hand, I can't stand such parasites making money in the name of religion.
Moreover, as soon as many Rabbis hear that I write on the Internet, they immediately ask me to write about their institution or doings. Usually I don't do it unless someone has really something to offer and is contributing to society. Generally speaking, I am very careful today, to whom I donate money and in the case of the Torah scroll, I still regret that I gave money because my feeling tells me that the money went somewhere else.