Thing is though that playing tighter means, primarily, that your hands are gonna be higher-quality and hit something good (or even dominating) more often than everyone else's. In a sense it's exploitable, but it's just easier to exploit a tight image than be exploited through it generally speaking.
Like, think about it: You open UTG and the board comes down 56T 2-tone. If your UTG range is AK, SBs, SCs, PPs and SAs (and doesn't for instance include AQ, AJ or KQ, so it's 12% rather than the usual 16%), then it's harder for you to have two random offsuited overs and thus much easier for you to have sets, 65, 87, AT+FD, etc. so your range is very strong in that spot. It becomes harder not to give you credibility when you bet.
Or likewise, if your open range from the CO is tighter than usual (cut out some weaker Ace-rags, most offsuited connectors and suited one-gappers and weaker two-broadway hands or ragged face cards like K9o) it becomes much harder to resteal because in position you don't have to fold many hands you open to resteal.
In my own experience the reason 18/14 players are exploitable, usually, is that they tend to be really bad ABC nits that will fold their blinds way too much and then fold flop every time they miss so you can steal a zillion of their pots and profit; but that's not a direct consequence of playing that tight -- it's just that people who play that tight are usually that stupid. You don't really have to be.
I'm just gonna load a ton of tables and run like a 18/14 (yes at 6max)
