Cashing out for HEM is fine, but don't put your initial deposit in your pocket. 5BI at 5nl can take 5,000 hands, and 5,000 hands at 25nl or 50nl= ~100 or ~300 dollars respectively (considering differing win rates). So you're costing yourself $250 by cashing out for $50 now if you see yourself beating 50nl in the future.