how many units per spin is worth it?

[2nd12forlife]

With one of my new systems...actually been working on this one in particular for 3 years now, I average about 1 unit every 24 spins, I am using$ 10 units.  Now its not so much me sitting at a table for 24 spins...I move from table to table betting when I see an entry point.  I play at the taj mahal which has about 10 tables conveniant enough to move around to, but if its crowded let's say 5 tables.  A spin a minute? So about 2.5 minutes for one unit gain.  $240 an hour...although I somewhat want to use $5 units, which is substantially cheaper for the system.   Does that ratio sound worth it? What in all your oppinions would be the minimum per spin to be worth it?

[2nd12forlife]

-