I would say if they show up on your movers list every day they are serious. Why would they go through all that trouble to earn the daily VP if they were not serious?
I don't think you can measure it by the amount of money they spent - they might not have money to spend but they are as serious as a heart attack to earn money - even if it takes them longer. They might not move and grow their business as fast as somebody with money to spend but they are moving towards earning money.
If you can see they are trying and it is possible for you to do so - send them gift certificates or t-credits to help them along the way.
Encourage them to play games to earn T-credits that they can use to earn more VP. I would say somebody that does not log in every day is not that serious - but they might not be worried about the streak badges and have a standing order to keep them qualifying as EA's
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I would say if they show up on your movers list every day they are serious. Why would they go through all that trouble to earn the daily VP if they were not serious?
I don't think you can measure it by the amount of money they spent - they might not have money to spend but they are as serious as a heart attack to earn money - even if it takes them longer. They might not move and grow their business as fast as somebody with money to spend but they are moving towards earning money.