I think a lot of it has to do with who travels with you - when you're camping with kids, these items can be a lot more "necessary" than when you're solo or a couple.
With that, I would buy things slowly and see if they continue to be wants/needs or if the excitement of something new wears off.
I say that as someone who has an ez-up and a table and a grill and rarely uses them. They were all bought for the times I was camping with other people and had a need for them and I got them at clearance prices (lower than currently showing). I would not have paid the current prices for them.
The table I bought was this one
Alps Mountaineering dining table - large. I really like that it rolls up small - about the size of a bag chair. It's a nice height for preparing food, etc. Most places I camp have a picnic table at the campsites, so I only bring it if I'm boondocking.
The canopy I bought was this one
canopy. It works well, but is bulky so I only bring under very stringent conditions (no rain, hot, no shade) that I'm rarely camping under.
The grill I bought was this one
Coleman Fold'n'go. This fits into an inside cupboard, so I have it all the time. I really only use it if there are others camping with me and I need the extra space inside the RV for food prep (otherwise I cook on my stovetop and/or oven inside).
My current "purchase something new" rule is that I have to have been on at least 3 trips where I found I "needed" the item before I will buy it. Every trip there is something that I think "oh, yeah, that would be real handy right now" - but usually I forget about it by the next trip for some new "handy item". If I find it would be useful 3 trips in a row, then odds are I'll actually use it enough to make it worthwhile.
