Sandals are best suited for shorter walks on surfaces that don't have much litter or gravel, which tends to get picked up by any sandal design. Once used to the sandals, some walkers wear them regularly for 10 kilometers or longer walks. While trail sandals are big sellers, hikers often report they are best used for daypacking or in camp rather than when carrying a heavy backpack on natural trails. That said, many long-distance walkers on the Camino de Santiago wear trail sandals some or all of the time. It is an individual choice. You should definitely try them on shorter walks before tackling long distance walks in sandals.
You likely don’t want to purchase our cheap sandals every year. While there are going to be a few shoes that you're going to buy simply because they are ones you cannot pass up, you're going to want to keep wearing your favorites year after year. The question is, how are you going to maintain these shoes throughout the year so they can be available to you. One of the best ways to maintain your cheap sandals is to do a little advance care. First, remember that these are shoes you're simply not going to be wearing any socks with. As a result, you're going to want to make sure that your feet are always clean before you put your shoes on.