Loose aggressive can be very entertaining indeed, especially in cash games. Personally, I switch it up sometimes based on the table, but most of the time I only choose to play laggy when I'm feeling confident.

Lefou put it good - there is an intangible momentum you pick up when you're playing your a-game laggy and are in the zone. You hit hands, you push people out, and build a huge stack. You still need to know when to give up, though.

I don't think you need to lose a buyin or two - thats kinda hard to come off of if you start out every session that bad. You'll lose plenty of buyins from getting yourself into marginal situations vs people who you know think you're full of shit. You'll also catch some crazy bad beats, but thats a good thing.

But don't forget that tight-aggressive is a very, very solid strategy. You should make plenty of money playing that way too. Not weak-tight or tight-passive...true tight-aggressive. You are still allowed to bluff, semi-bluff, and raise preflop when playing a solid tag game.