I actually support the idea of starting new managers on a sort of "probation" for two reasons.
First, as is the general theme of this thread, is that it prevents new players from wrecking their finances on day one.
Second, more my GM perspective on things, is it would probably prevent some attempts at cheating. If there is a 30-day period that prevents a new manager from spending, say, more than 75% of their current weekly TV contract revenue on a single player, and then somebody wants to create a second team to buy a player they just put on the TL, then they're just going to have to plan a month in advance before listing the player so that their illegal team can get past the probation period before bidding a large amount. This will filter out some of the potential cheaters since many cheaters are impatient and won't wait.
Don't ask what sort of Chunks they are, you probably don't want to know. Blowing Chunks since Season 4!