Can't remember the exact amount but it was around hundreds. maybe... around 400-500 I think. Heard some did solo mining on powerful PCs earning tens of thousands.
For those who just started mining, here's my experience. Screw whoever that says U can't earn with DDR2-grade PCs. Just need more work than just collect and hodl/withdraw.
core2duo la. socket lga775 pc. that's like.... 7 8 9 year-old processors. the 1050Ti is in a X58 Asus Sabertooth mobo, LGA1366, first gen i7.
nicehash doesn't support them unless you modify the config file for certain coins like monero to include CPUs using xmr-stak in nicehash folder/bin/xmr-stak/cpu.txt (set to use 1/2 of the cores, so daily pc still can use). but I didn't, and just use the GPU's to mine. I don't really turn off my PCs, and I set nicehash to mine when idle on non-dedicated machines.
no overheating, as I cleaned the pc beforehand, and replaced the thermal compound as it's way too old, and just letak a RM20 CM fan on the GPU to cool the GPU and the CPU. on HD6850 temp stays 70-80C, 750Ti 60C, 1050Ti 65C.
I also got some shit GPU like a fanless R5 230 that got me like RM15 a month, but retired because it's just too shit

If you ask me, the key is not big budget, or small budget for something like this. you can get a RM50k mining pc if you want, but if the ROI takes 1 month then go for it! For me these old crap are already free. 750Ti I got it at a massive discount, RM50 only. ROI in 10 days. TDP 60W, about RM22 electricity cost. some days in a month that card got me RM7/day.
just with the old pcs, I managed to get about 0.014 BTC @ RM420 for few months of mining with nicehash, when BTC was around 5k USD I think. When BTC was 20k USD, I shapeshift them into Dash (fee is a bitch, but it's in a wallet, and BTC transfer fee was even worse), then Dash-BTC market rose up like mad when BTC fell down. Transferred back to BTC, and I got shitloads more than just 0.014 originally. then I heard Roger Ver's shit twitter manipulating btc to pump and dump bcash. so I also pump and dump la, sold btc for bcash. then when bcash went USD3k I sold it back to BTC. some I take out for Dash, sent it to cryptopia, and just exchanged for some shitcoins like XVG la, Doge la, DGB la, and a bunch of others. some got me profit almost immediately, those coins rose up like mad, like KAVI up by 1700% against BTC. I think I put like 0.005 BTC on it, and managed to sell it for 0.085 BTC (RM30>RM500). Good thing Luno is having withdrawal problem, I just do simple trade like this. even of some of those shitcoins rugi like 3%, 5%, or even 10%, I don't mind as I think all of these coins that I got are of equal amount (0.005 BTC) and KAVI and DGB and a few others punya insane profit can cover those rugi coins just fine, and I'm in no rush to cash out when luno and btc tx are having issues.

This is just now. if you park RM1k worth of BTC at 1/4 of these coins combined, good enough margin for the day wat. even if just 5% increase, that's 5% more than simply park at btc and hodl.
so if you want to cash out every month, this "strategy" won't work for you.
I'm actively scouting for cheap old cards around kl, so now that you know what I know, and still wanna sell cheap cards, please pm me!
