connect is for sellers that have their own subscription plans for recurring billing (like say one reiki session a week bought in packs of 4 for one month of reiki sessions once per week) which are not in your own stripe account .  
so, sellers that aren't you, but want to sell on the site via stripe directly, can do so via marketplace.
you set the % inside the stripe connect module in una studio that dictates the % you take from their recurring billing, and also for a one time purchase.  

in this way you can get a percentage of all sales done through other peoples stripe accounts on the site.

which brings me to another question for mark, but a simpler one,

Mark - is the "accounts" section in the stripe connect module designed to show OTHER connected stripe accounts on the site, but not your own?

- because my personal stripe account is configured properly and working, (i've tested it in live mode), 

-but yet i do not see it under "accounts" as shown in the following jpg.

Mark P