Well aerating 10k by just standing and riding in only 15 minutes seems to be worth the price of the ride on. Production could stay pretty high. Plus the ability to add pressure to increase plug depth on hard ground is nice.
I hated to aerate with a wb clausen. I don't mind doing it now.
The big difference is do you have guys to run the aerators? I don't and the ride on is good for me. If I had 2-3 guys with little to do buying 3 wb aerators might be a possible better return.