In response to the question posted by @valid lotus today: "... currently the plan is to release new stretch goals with new achievement rewards each Wave, do people prefer this over maintaining stretch goals without a reset? interested to get some thoughts."
For lower level rewards, I think they could be reset for every wave (especially if they're in some way tied to a wave, like the get a free Standard/Mega disk from the next wave).
For higher level rewards, I don't think they should be reset every wave. Even if kept over the course of a full set I don't think a lot of people will be able to reach that goal.
For cosmetic rewards that are appealing to a lot of players, locking them behinda a one-time-chance event isn't really a good incentive.
Your average player will see the reward then desire to get it. If they then find out it's a (for them) impossibly high goal to reach in a very short amount of time it will most likely demotivate them to even go for the goal.
Or even worse. They're late to the party and missed the event in the first place, and are now permanently locked out of ever getting the reward (with the exception of the secondary market should someone list one there). Then they might lose motivation/interest in the game altogether. (I know this from experience from other games I've played).
So instead of limiting the rewards to a specific set/wave, I propose the following:
Keep the rewards as is for now and add a "Latecomer" option to gain those same rewards later, but at increased cost/effort.
This can be done in a number of ways, I'll give some examples:
- Make non-set-bound goals at a higher rate (like 5-10x higher than the initial ones).
- Have a limited number of yearly events where players can earn Reward credits to purchase old rewards (This can be tailored to allow players a limited number of "missed" rewards over a certain time period).
I think a system like this would be more appealing for the general player.
rare should stay rare