Holy shit! We have MOSQUITO LASER AUTO-TURRETS! That may be even cooler than Bitcoin.
Assuming 500 average dead per day per $50 unit, with a $50M investment, we could be knocking off ~500M mosquitoes per day, or >182B mosquitoes per year. Guesstimates on global mosquito population vary wildly, but it looks like it's somewhere between 100T-1Q, with an estimated annual birthrate of ~200B-1T. Combined with already-used pesticides (another everything-killer which can be put out of commission), our unfortunate flying friends who eat the mosquitoes, and a much bigger investment ($50M for 600k-3M human lives per year is crazy-greedy -- it'd probably be more like a $1-5T investment), we have a pretty solid chance of eliminating mosquitoes within a few decades with a rapid decrease in population as soon as units are produced in mass-scale.
I'd guess mosquitoes make for decent compost, too. I wonder if you'd end up with a noticeable giant blood stain if it were set up over asphalt...
I'm changing my answer to mosquito laser purchases and NPO funding for mosquito lasers.
ETA: Numbers are way off and can't really be measured per annum. Birthrate must be way higher given mosquitoes only live ~3-100 days.
Most mosquitoes over 95 days old have a horrible life:
Sitting all day in an
old mosquitoes nursing home just drooling and watching TV.