You don't have to upgrade, it's an option.
Since you're in the USA, it is easy to do some offers/surveys/tasks/videos/etc each day.
Of course that is an option also.
In fact, allow me to do just a tad of math as a real example:
View ads each day: 5 cents
View a few videos: 2 cent
Complete one survey: 60 cents
Complete one task: 3 cents
Complete one offer: 5 cents
Total daily earnings: 75 cents
Monthly earnings: $22.50
Yearly earnings: $270.00
Of course, I made the amounts in my example above, very low. Reality is, you could earn
much more than that. In addition, I did not even mention in my example, checklist bonus.
After upgrading, in my example, with absolutely no referrals and little work, you'd still be
in profit $250.00.
Look again at my example. I am stating you making only .75 cents per day.
I don't understand really why some times there is a post about someone going to upgrade
or not going to upgrade or if they should or shouldn't. You really should NOT allow any one
to talk you into one way or the other. It's a personal decision. You know what you will do
and what you won't do. So if you are not going to do any work here then of course it would
be silly to upgrade, especially if you have no activity on your levels.