Player Rewards

Ive been wanting to give players rewards for rolling a nat 20 on a die roll. These rewards are for the player, not the character. Been thinking of each nat 20 gets a D&D themed sticker (I have 100s) Also thinking of a tiered reward system for nat 20s like random grab out of my D20 bag and for 20 nat 20s a dice set. been having a hard time coming up with more rewards that become bigger as they rack up nat 20s. Also thinking of resetting them back to 0 once they get the 20th nat 20 and starting the ladder over. So far I have:

Each 20, a sticker. My players use plain colored boxes similar to shoe boxes for character stuff (coins, gems, keys etc) thinking they could deco the box with stickers.

5th nat 20 = ?

10th nat 20 = ?

15th nat 20 = Random D20

20th nat 20 = Random Dice Set

Any ideas for the 5th and 10th slot would be great, also not opposed to moving the D20 down to the 10th spot if something more interesting comes up to take the 15th spot.

Thanks All!

Depending on how often you play, this could wind up expensive for you!

I would consider, if I were you, awarding these as inspiration related instead. Rather than a random number generator (sorry Wizard, all you do is force saves so you don't roll any dice), when you give people inspiration for roleplay or clever plans and all that jazz, include a sticker.

That way you encourage interesting play and roleplay, rather than "roll as many dice as possible". 

For the two missing tiers, do you have any larger stickers? Alternatively, for every 5th or 10th, give them one die from the dice set, so that they build it up over time? That way, if you want to keep going, you can get them each another dice set, and you're good for 35-70 more nat 20's / inspirations? That way you don't have to increase the reward each time, if that makes sense!

Personally, I'm not sure turning dice rolls into what's essentially a lottery is the best idea. A crit or near-guaranteed success on a save is reward enough, I think.

The thoughtfulness and care directed at your players, that feeling behind the idea is good, but I don't think the idea itself is wise, if only for budgetary reasons. Some players will be rolling a lot more dice than other players due to the nature of their characters. A Nat 20 is reward in itself.

I think im going to change it up, each 20 is still worth a sticker, but at 5 10 and 20 they get to pull one die out of my die bag. The bag will have maybe 10 sets in it all mixed up. Hoping they will get excited about trying to complete a set and trade with others that have pulled a die. Most of the players at the table are either new to the game or young, some are both. Just looking to inject some excitement. While I have the budget to get the dice sets, they do not, so its a little boost for them as well.