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There's no good reason why it should be easier to grapple-and-blind someone than just grapple them. This feat is NOT designed to allow you to bypass the carefully-constructed defenses of someone who is grapple-resistant by boxing their ears while you also try to pin them down.
Instead, it's an option to attempt something harder for greater effect, in the long tradition of such feats dating back to Power Attack. Rather than give you an actual penalty, this feat just says since you are attempting to perform TWO maneuvers simultaneously, the thing you are least expert in determines your offensive capability, and if your foe is particularly good at defending against either kind of attack, that defense doesn't mysteriously evaporate when you try something...
Yet, with Greater Grapple, available with less prerequisites, you can maintain your grapple with a MOVE action, gain the +2 from the feat, and the +5 for maintaining, and do your Dirty Trick as your standard action (penalties from having the grappled condition equaling out). Dirty Grapple allows you to do a dirty trick while initiating a grapple, but penalizes you severely in the process. Later, if you choose Rapid Grappler, you can maintain, pin/damage/move, and dirty trick all in the same round.
The full round action to combine two standard actions at BAB +6 should have been enough for these feats, without the added penalties. The fact that the CRB had a way to combine maintaining a grapple with other combat maneuvers rubs salt in this wound.
Cads, Unarmed Fighters, Dirty Fighters, also have better ways of combining dirty tricks with other actions than these "Dirty X" feats.
EDIT: The above are opinions,and I think I've stated them as well as I can, so I will leave off with them, rather than get too repetitive.