I vote yes to decay. As many have argued placing limits on building would also help lag. But in my mind limits are limiting. If you want to go big, go big.
Limiting building doesn't help the economy. PvE can be too easy. I love cracking nodes as much as the next guy. But after the first four days there's nothing left to do. I embrace the constraints that will come with decay, even at reduced rate. In some ways it makes life easier. Need to modify your base? Just cut the foundations to that section and let decay demo it for you.
Upkeep to my mind is a non argument. If you've never taken a chainsaw into the woods with a pure wood tea then I can understand why you're freaking out. Fifteen minutes and you have more materials than you know what to do with. People on the server love to farm. Buy their teas. It'll make them happy and you too.