Comment by kingstnap

I think that it should be a ramping rate, the idea being that a 1x landlord should be able to outbid a 2x landlord and so on.

In theory this encourages a sort of spreading effect where at some point the Nth property is too expensive to buy to rent or speculate on, which naturally stops the exponential effect of making land lording your full time gig by continuously expanding the portfolio.