Autobid are interesting but it was tried in Hattrick and unfortunately it haven´t work very well. Daytrading plus buying a new team short for playoffs are big problem which is unreal and made this game not as fun to play as it should. So I think it´s important to come with as many ideas how to solve it as possible.
I guess the question here is whether autobids are to be viewed as a tool used as a solution to daytrading or as something simply used to bring more time zone agnosticism (for lack of better term) to the transfer market. It certainly wouldn't have any real utility in preventing the late season team buying, and as long as managers have complete freedom to set the initial bid price for their player swaps, it wouldn't address some of the more egregious daytrading.
I do recollect that I enjoyed the autobid process in Hattrick immensely, though, because it allowed bids to reach a player's true worth faster, rather than having the price sit very low until a few hours before the transfer closed. If you're selling a player in the hopes of using the money to find a replacement (as one might in a training situation), that may be of some real benefit.