Instead of thinking of ways to motivate people to buy your product – why not focus on solving the consumer’s pain points. Solve for those, and the buying happens organically.
I personally am tasked with ‘selling’ ideas, concepts and more. But I don’t approach it from pushing the purchase- I like to lay out how it solves for the problem. How it fills the hole. How it soothes the ‘pain’. By doing that- you are being authentic about your motives. And yes, sincerity can exist in a sales driven world. Both by marketers and brands.
Remember, being helpful always wins.