I don't really see why there would be one. I mean, within reason. But we're probably somewhere around 2^64
2 to 64th power. The (^) symbol is used to denote the mathematical exponent.
(pretty large number - which I would doubt, probably more like 2^32 )
I think casperes1996 is trying to say that the number of stickies could be more than would be useful to anyone.
Or, I think the limit would be in your ability to keep stickies organized in some practical way.
Think about it... If you had "only" 100,000 stickies, how would you even use them?
I only have about 40 stickies, and I still have to take some time to discover where I left that little bit of info.
But, then I built up my stickies mostly during the time when I was running Jaguar (!), and might add/edit stickies once or twice a year, at most. I have some REALLY ancient Mac info there, notes about extensions in OS 9, lots of links to sites that no longer exist, etc. I gotta clean that stuff up one of these days...
I think of stickies in the same way that I use an office bulletin board (or an idea board, whatever). It's always a good idea to review that pile of sticky notes that you seem to put everywhere, and weed out the ones that are outdated, or simply no longer useful. Well, at least that's my theory - that I try to do, while I remember what all those notes actually meant.
I have mostly abandoned using Stickies because the database is machine specific (not portable). One analogy would be the refrigerator.
Let's say I keep a grocery shopping list on a physical Post-It note on my fridge, adding items as I think of them. Perhaps I think of something to add to the list while I'm at work; I have to remember when I get home to add it to the list. What if I forget to peel the Post-It off my fridge before I head off to the grocery store? Now I'm stuck trying to remember what was on the sticky.
With Notes and cloud services, I can create a shopping list that can be shared on multiple devices.
The only time I use Stickies these days is as a short term cut-and-paste scratchpad. I don't put any real ideas or thoughts on Stickies anymore since they aren't portable. Whatever I put on a Sticky nowadays is usually no longer needed the next time I open up the Stickies program, basically disposable information (just like the way I treat physical Post-It notes).