LAG poker is very effective against tight opponents such as nits, who are afraid of marginal situations and playing big pots with anything less than the nuts. They’ll let the LAG push them around and the LAG will pick up enough pots to make up for the few times that they do get caught out.
Straightforward players who follow the TAG style to the letter are easy to exploit with the LAG style. This includes beginners, who aren’t experienced enough to cope – and multi-tabling grinders, who play robotically and avoid marginal situations at all costs.
In the later stages of tournaments, the LAG style is usually much more optimal than playing TAG poker. Rising blinds and antes means you must open up wider or risk being blinded out. Cash games with antes also punish tighter play, so it’s mathematically advantageous to open up wider.