I mean get the infra to be above 14k. He is sitting at 8k or so if I remember correctly.
Also, I think the infra limit has changed.
I was at 16400 infra, I bought 10 just now...
My bills increased 17577.60, my income increased 19696.16.
2k increase in daily income is not too bad.(of course this is different for trades, enviroments, wonders etc)