Letting her think you are going to Sugars does free up some time to pursue other action. Also gives you flexibility to see what Sugar Babies is all about (check ECCIE's section for many great posts).
Above all, don't rub it in her face or make it too easy for her to catch you. There are some open marriages that the women likes to hear all the details, but that's usually ones that are still active with their husbands. I love my wife too much to hurt her with finding out. Personally, I won't stray if I got my "quota" at home. I think a lot of married guys feel the same way.
Back in the old days, married women often turned a blind eye towards the husband having a mistress. She wanted to avoid the social embarrassment rather than her feelings in that male dominated society. We have a modern twist on it today.