I've been vending for awhile now and so I could have sworn the prize for vending was originally set at 5,000 vends. Am I mistaken or did the increase happen to go up to 10,000 rather than 5,000 vends? Was this due to too many people reaching the 5,000 mark? Or am I just crazy in thinking that the 5,000 vend was the original prize vend?
Nope, I'm pretty sure the prize for the vending tiers was always set at 10,000.
Might be nice if it was at 5,000 though. Vending has never excited me...x'D
Hmm, but I kind of remember it being at 5,000 as that was the last tier before another was added (at least I think the other was recently added...)
i always check out 's achievement thread for confirmation of suspected achievements. that thread has been maintained from the get-go.
it does show an achievement at 5k vends.

There is a an achievement at 5K vend, but there is one at 10K as well, and the reward was given there