Web Platform Progression and Economy System Design

I’m building a new web-based product that relies on a compelling, retention-driven progression loop rather than traditional gameplay. I already have the feature ideas in place; what I need from you is the math and structural design that will keep users climbing, comparing, and coming back.

Here’s the core of the assignment:

• Balance an experience (EXP) formula that feels rewarding in the early stages yet stretches gracefully into late-game longevity.
• Plot a clear level curve and connect it to a rank/tier ladder so that players feel visible status gains at meaningful intervals.
• Layer in Subscription/VIP perks that complement, but never break, the core loop.
• Calibrate rewards primarily in the form of in-game currency drops and experience bonuses, ensuring every session feels worthwhile.
• Deliver a progression structure document plus a balancing spreadsheet that I can slot straight into our database. Include tier tables, reward tables, and your rationale so future tweaks are easy.
• Close with practical suggestions for monthly or seasonal updates that extend engagement.

If you’ve built leveling curves, battle passes, social-casino style VIP programs, or other loyalty mechanics before, I’d love to see those examples. Clear spreadsheets, sensible formulas, and concise documentation will be the yardsticks for success.