I made some calcul, concerning my miner ,fixed th/s. And if it's interesting to invest in a miner actually.

My miner produce 14980 th/s (  value 65844 + old rack ( 3K ) )

Network                %            sat / claim                     per day
20000 PH/s   0,0749      1,498                            431,424
30000 PH/s   0,0499      0,9986666667               287,616


In fact more the network grow , less my fixed miner win. Are you going to grow the power of each miner? I buy for 65844 sat into miner. with 287.616 sat/day, this represent  228 days, to recover these sat. As the network will grow, i don't think it's a good idea to buy miner, and i don't think it's the idea to avoid buy miner.
Calcul based with average of  5 min between claim.

Regards
Samothrace