I'm trying to see where the market is. Charging people for "Upgraded" accounts is a great way to make revenue, but it can also hurt you if you over price your services. Even more harrowing is the economy: who has money to frivolously spend on an online game?
Most Virtual Pet sites I've seen are in the $15-$20 PER YEAR range, but I'm not just looking for sites that fit into that category.
What do most people charge for an Upgraded account and do you charge yearly or monthly? Also, how do you keep the upgrades incoming (i.e. sales, promotions, "freebies")?
Do you think people would be more apt to do a monthly upgrade (pay $5/month) or pay bulk ($60)?