Tanking for the draft isn't as done as you think. Nor do I think (so I might be wrong) it's that efficient to throw a season and demote for the draft.
I agree that currently it is a valid strategy - both for income and for draft.
However, much like the NBA, with a new league starting, I - and it may be I am in a small minority thus the poll - would prefer to see tanking lose as many incentives as possible.
In case someone wants to see the 'Wheel' draft here is the NBA Proposal.
http://www.cbssports.com/nba/eye-on-basketball/24385704/report-nba-set-to-consider-wheel-concept-to-replace-draft-lottery
It is not linear, but averages around the mean. I believe it is a solid foundation for a long term league, but others may disagree.
Regardless, I enjoy Buzzer Beater and an glad a 2nd league is forming.