I think the pools have been stabilized with their payouts for, let's say half their lifetime now, so we're dealing with about a 75% of 50% of 97.6% of 90% of 10315, or about 1132 bytes, which is only about 51% larger than fluffypony explained.
The original pool payouts were absolutely terrible, but even after the dust fix they can still be quite small, paying out as little 0.1-0.3, which is something like 4 USD cents. That creates an excess of small output on the chain and makes subsequent transctions larger too.
Unless we expect Monero to be used for microtransactions in a big way, the mix will change once mining and trading of recently-mined coins is a much smaller proportion of usage.
I see that it's not getting bigger, but please, understand that this is a massive number.
In terms of storage on your computer, it is not. A moderate 1 TB hard drive costs about 60 USD so a 3 GB file costs you about 18 USD cents. A 100 GB SSD is about the same, so 1.80 USD. If you don't think running Monero is worth 0.18-1.80 USD (a one time cost that you can recover by uninstalling it) to you then I guess its kind of a waste of time to even discuss.
Monero is worth, to me, whatever it is I can afford to pay. My hard drive space is nothing compared to the bandwidth it takes to both utilize my own hard-drive space as well as share the blockchain with as many people as possible, which may will be worth much more than $.18. Again, this is under the idea that the price of hard drive space will trend toward zero because legitimate pruning is a possibility and not just size reduction.
But, how much bandwidth does the daemon use a month?
Admittedly, it's not being shared across a 3g or 4g network, but if it's even more than 1gb a month, then it's likely more costly than $.18.
Actually, if my bandwidth was capped at 150 GB /month and I was paying the same $60 a month I do now, and you're saying it will cost me between $.18 cents to $1.8 then I would expect to use anywhere from 450 mb to 4.5 gb a month from just running my daemon on a standard broadband connnection.
If this was a 3g or 4g network, I would expect 10x that, at $1.8 to $18 a month. This is still affordable, if necessary, if Monero were to require it for usage.
Is .45 to 4.5 gb a month an expected amount of usage of the monero daemon?