With a cost of $120 and only $5 in return from 2 FTDs, the conversion rate is lower than average, but it can still happen if the funnel is not optimized, the cloaking is not clean, or the targeting is not accurate. In reality, in this niche, the click-to-reg rate usually fluctuates between 10-25%, and the reg-to-FTD is around 5-15% depending on the offer and traffic. If the creative is not convincing enough, the prelander is weak, or there is junk traffic (fake clicks, not interested in the product), the results will be very difficult to scale. You should monitor a few more rounds of testing, adjust in small steps to determine the cause and gradually improve performance.