I didn't say abortions is most of what Planned Parenthood does, I said they are so large so as to be almost all of the U.S. abortion industry. Are you saying Planned Parenthood does not support itself?
Of the about 893,000 abortions in the U.S. last year (2017), Planned Parenthood performed about 328,348 of them. Having over a 1/3 of the multi-million dollar a year industry certainly gives it a leg up on discovering its reason for being. But, I admit I was wrong when I said they were "most" of the industry. They are just the largest profiteer in it.
HOWEVER, the point is not to argue abortion. (At least from me.) The point is that, if we arbitrarily assign an value on a civil right of zero to those who want to keep and bear arms, why can't people on the other side of the political spectrum assign zero value to the civil right of keeping the government out of our personal, reproductive decisions? It is easy to come to a solution when you think the other side has no point.
The majority of NRA spending is for newsletters, event organizing (shooting sport), and gun training and safety courses. The revenue, in 2016, was $163.5 million from dues, $171 million from donations, $69 million from program fees (entry to events or classes) and $30 million from all that sweet, sweet blood money investment. Even if we were to assume ALL of the donation category was from gun manufacturers (Which, it is not. There are lists of large non-industry contributors out there but I'm not going to go through and total up those donations.) we have the majority of the revenue from individual sources.