Yes, the number of active offers you can have is determined by your chosen plan. For more details, please refer to our Pricing page, which provides a complete feature comparison of all packages.
Having more active offers becomes particularly beneficial when you have a growing number of affiliates in the system. Each offer can serve as a way to distinguish between affiliates' traffic sources and their promotion methods, or you can use offers to set different payout rates for various types of affiliates.
Generally using more offers on one product is not recommended. Having more offers in general means tracking of two completely different funnels that don't mix, or one of the above mentioned situations.