Look up my username on gridcoinstats about 6 months ago
[ ... ]
at 10k balance I was staking 150 GRC at a shot. That simply is not happening now, and will not be happening in the future as things stand and I understood Hive account@dutch's explanation correctly.

Reductions in POR rewards are likely due to the substantial growth in team Gridcoin this year; thousands of more users have joined through pools or solo so the difficulty and competition to earn large magnitudes has increased. You need to competitively crunch, picking the projects with most compatibility with your machines and the least user participation/competition (crunch less popular projects).

The changes won't affect your payment amounts, rather the frequency at which you are paid will potentially decrease.