Increase the rewards from daily bills. Alternatives are always good.

Limit kills to once per week. So more people could actually get something.

Make the marks more like treasure hunts. Having a set time window to spawn is pretty silly, whoever killed them last will be able to do it again more easily.

Put a weekly Allied Seal cap in place. Isn't this already planned?

Limit certain rewards and adjust prices. Some of those prices are indeed ridiculous.

All of these would improve the hunts.