It doesn't need much to hit, yes. But in terms of build options it's quite a lot since you're locking out the other possible EPP/PPPs on top off taking Tactics. That's a significantly larger sacrifice than a Blaster dipping into Leadership for Tactics.
That's why i suggested buffing Domination's ToHit buff duration, feels like i'm walking in circles in this discussion.
If you follow the argument, you'll stop walking in circles.
1)Domination currently offers a 25% to hit buff for 15 seconds. That's about a 7.5% uptime out of the box. If it lasts the duration of Domination that's a 45% uptime of the box. That's an enormous boost for the duration.
2)The suggestion to lower the to hit buff to 10% and stretch the duration of the power to match domination has wide reaching implications outside of instant snipes. It is a buff to nearly all powers in a Dominator's arsenal. To hit buffs are much more powerful than simply slotting for accuracy.
You are advocating for an AT wide buff, including sets that do not even include a snipe (i.e Earth Assault, Icy Assault, and Thorn Assault) , in order to address the issues with snipe powers. It's simply bad design to deploy wide reaching changes to address acute issues. If you want to specifically address the issue of Dominators struggling to achieve insta-snipe, the solution should be in those powers.