When the CAP threshold is negative and all payouts are 0 (no bets placed),
the system was only selecting one result (e.g., always DRAW) instead of
considering all results with equal payouts.

Changes:
- Fixed fallback selection to include ALL results with minimum payout
- Weighted random selection now properly considers all tied results
- Outcomes with better odds (lower coefficients) have higher probability

This ensures fair random selection among all possible outcomes when
multiple results have the same payout, weighted by their odds.