Years ago, I tried to convince a beer festival client to use online ticketing. At the time, the client was manually processing thousands of ticket orders through PayPal.
Each year, it took between 30-40 hours to manually fulfill all the ticket orders. All the ticket fulfillment work was relegated to one staff member. Not exactly time efficient and that person was less than thrilled! Have you ever addressed by hand and stuffed thousands of postal envelopes? Not fun!