My guess is offering a more comprehensive free account will get you more signups, which could increase the amount that convert to paying, however personally I a

My guess is offering a more comprehensive free account will get you more signups, which could increase the amount that convert to paying, however personally I am extremely unlikely to throw down money without getting a good taste of what I am buying. You say you have very basic free accounts: do those free accounts tease the users into becoming a paid account holder? Meaning, I signup and use your service and notice 'oh wow, they offer ___', only to click the button and be upsold? I think the tease/upsell could be extremely effective, if your service presents itself as excellent and comprehensive. On the other hand, just because you increase revenue doesn't mean you are more profitable. How much extra time do you allot to supporting free accounts? Will they be more of a drag than it's worth?