Actually you should keep your vendors after resets. They are put back in the pool and should show up at the top left as Available Vendors.
If they aren't there you might have encountered a bug. In this case please send me some additional information about the amount of vendors you had and roughly when you did the reset.
 "Crafting Idle Clicker"){kind=icon}
 "Dangerous adventure"){kind=icon}
 "Tactical Assassin 2"){kind=icon}
Actually you should keep your vendors after resets. They are put back in the pool and should show up at the top left as Available Vendors. If they aren't there you might have encountered a bug. In this case please send me some additional information about the amount of vendors you had and roughly when you did the reset.