Lol the week you described does sound like something jagex would do to be honest. Now this would be a very fair week:
Day 1: 200m prises are red rarity. Day 2: Loyalty points on TH Day 3: Prismania with 10x loot chests. Day 4: Only skilling outfit pieces are up for grabs. Day 5: New discontinued items combined with components. Day 6: Chance to win Dtd, aura refreshes, life refreshes, etc. Day 7: Double keys, with double rewards, which double your base exp.