The targeted distributions with DSTs are based on the original investment amount. But, theoretically, if you invest $100,000 in a DST with a 10% load and five years later the property sells for the same price it was purchased, you would have $90,000 left to roll into an exchange. It's important to look at the track record of the sponsor and how successful they've been in returning at least the original capital to investors at the sale. While that isn't a guarantee of future success, it gives you an idea of their experience. Some sponsors sell to REITs that may pay a premium, others may have different relationships/strategies for exits. Most DSTs have a disposition fee on the back end that they only receive after they've returned original capital, giving them an incentive to do so.
Work with a group that has experience with the sponsors and knows what potential red flags to look for in each offering so you might mitigate potential risks.