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Short periods don't work as well because there's a 1 week delay before delegated steem "returns". So short delegations would end up being much more expensive. But it's a possibility if there is enough interest. It might be a good way for an author to quickly gain attention for a series of posts in order to establish themselves.

I totally agree with you @blocktrades. It is a good and bad side but I see with this delegate a lot of steemians who can help themselves and the theme so this is a good idea. Thanks for share information @blocktrades

just a thought. But wouldn't a voting bot where the vote could be purchased for x days at a time at x voting strength accomplish this better than trying to buy delegation for less than say 2 weeks? Once the voting period is purchased it is up to the purchaser to make the posts to get themselves established.