Weighted vs random draft lottery: which is fair for your league?

Two ways to run a fantasy draft lottery: every team has equal odds (uniform random) or worse teams get better odds (weighted, NBA-style). Each is fair under a different definition of fair. Here's which one fits your league.

Uniform random: simplest, most defensible

Every team has 1/N odds at every slot. Last year's standings don't matter. Truly random. Hard to argue with.

This is the right choice for redraft leagues, because last year's standings already don't matter — every team starts fresh. It's also the right choice for any league where you don't trust the commissioner to pick a weighting scheme without bias.

Weighted: favors worse teams

The NBA's lottery gives the worst three teams the highest odds at the top pick, with diminishing odds for better-finishing teams. The math is designed to discourage tanking while still giving good teams a chance at top picks.

Most fantasy leagues that use weighted lotteries copy the NBA's structure: 14% odds for the worst team, 14% for the next, 14% for the next, then sloping down. It works best in keeper and dynasty leagues where good teams stay good for years and you want a counter-pressure to dynasties.

Linear weighting

A simpler weighting scheme: the worst team gets N lottery balls, the next gets N-1, down to 1 ball for the best team. Smoother slope than the NBA, easier to explain, slightly less protection against the very-best team getting an early pick anyway.

Custom weighting

Some leagues want to assign specific odds to specific teams — slot guarantees, range protections, top-3 lottery only. This is fair only if it's set in stone before any draft, ideally before the season starts.

The trust problem with weighted lotteries

Weighted lotteries introduce a parameter — the weights — that the commissioner chooses. That choice is itself a potential source of bias. If your league trusts the commissioner to pick the weights fairly, weighted is great. If not, uniform random is the safest move.