Whenever I’ve used a travel agent instead of ding it myself it’s something I quickly remorse. Reason why I’ve tried them is to help local companies by means of them receiving commission rather than it going to Expedia or even by the company airline. However the agent then becomes the client and owner of ‘your’ reservation and can become a gatekeeper to any document the airline, tour wholesaler or lodge holds about you. For me though the effect is to swear never again undergo the stress of getting used as a supply of earnings and the whole lack of transparency. Most wholesalers, e.g. who package European river cruises and the like have their very own toll free numbers anyway.
These businesses receive their pay from airways and hotels for booking prospects for them. So, typically you’ll simply pay for the price of your journey.