I only have 28 nominated files and I opted most of them for the 4 dollar plan and a small amount for the perpetual. Basically things I dont expect to sell anyway.
But renting for a year is a better option. Some files have been rented for 3 years now, so if it keeps getting nominated then 4 dollars a year is better than a one time payment of 10.
I see these files as a way to advertise my presence in the free collection and since my other files are featured below, I hope it leads to some add on sales.