Non trusted accounts go for around 50-75m 07
A trusted (by trusted I mean a member with a significant amount of vouches and activity on sythe, not someone moderately trusted) account could go for at minimum 100m 07 to be honest, it depends what other 99s the account has as well as the quests completed.
Most trusted users don't sell their maxed accounts however. Some people rent their mains to commission stakers from prices of 10-30m a week.