IO clarification

Gah. Could you imagine people combining purples?

Big money sink there!

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Especially if the combine failed

(Though to be fair that could only happen if you were combining different levels).

I combined a level 52 Membrane Exposure with a level 50. Waiting to see if it failed was the most excitement I've had in the game in a long time. =)

No dumb questions. Three in one power and three in another power results in two set bonuses, twice.

So long as there aren't any uniques, six in one power and six in another power results in five set bonuses, twice.

You will get the bonuses for having three of them slotted twice.

Yes, with a caveat. You cannot have more than 5 duplicates of the same bonus. This is mildly complicated. The bonus is generally not tied to the set. For example, both Crushing Impact and Doctored Wounds give +5% Recharge bonuses for slotting 5 pieces. If you slot 3 sets of Doc Wounds to five pieces and 3 sets of CI to five pieces, you might think you could get +30% recharge (six times +5%), but you will only get +25% recharge, because you can only have 5 of the +5% recharge bonuses.

A caveat on the caveat, what actually matters is not the size and type of the bonus, but effectively its name as viewed in your powers list under "Set Bonuses". I think +5% recharge is named Moderate Recharge Bonus. This matters because some special IOs have bonuses with their own unique name, and they don't count against things with the same bonus size/type but a different name. Luck of The Gambler +Recharge IOs give a 7.5% recharge bonus that's different from the 7.5% "Large Recharge Bonus" of sets like Sting of the Manticore or Basilisk's Gaze.