To find the expected value per ticket for the organization, we need to consider both the revenue from selling the tickets and the cost of the prize.

1. Revenue from tickets:
   The organization sells 3,000 tickets at $1 each, so the total revenue is: $3,000 \times 1 = \$3,000$

2. Cost of the prize:
   The prize is worth $500.

3. Net revenue:
   The net revenue for the organization is the total revenue minus the cost of the prize: $3,000 - 500 = \$2,500$

4. Expected value per ticket:
   Since the net revenue is $2,500 and 3,000 tickets are sold, the expected value per ticket for the organization is: $\frac{2,500}{3,000} = \frac{25}{30} = \frac{5}{6} \approx 0.83$

Therefore, the expected value per ticket for the organization is approximately $0.83.