The more reputable studies put the gay population at no more than 2% of the general population. If the culturally Catholic proportion of gays is the same as in the general population (about 25%), then we're down to 0.5% of the overall population. But many Catholic homosexuals have already repudiated their membership in the Church, so the number is even smaller than that, perhaps only half. Further, among those who haven't repudiated their membership, a sizeable number probably don't attend Mass on anything like a regular basis, either (let's assume half, again, which is actually better than the overall population, so I'm being generous), making the potential base for this "protest" very small indeed.
"Therefore," half of half of 0.5% of the 293,000,000 people in this country is...366,250 people. Nationwide. At most.
I don't think the Church will miss their money all that much! ;-)
That's because so many Gay Catholics are up there at the pulpit.