If the product is super early and want's early adopters to give feedback and shape up the product, lifetime deal can get those early users and also some money. Usually product hunters and early adopters love to help products and it is one of the channel to get them.
I believe that offering lifetime deal is a great idea. It helps to get more funds, onboard early adopters and brand advocates, and generate honest reviews, and other social proofs. All these things are going to help the company grow and gain more traction.
I'm not a SAAS company but I buy LTD's all the time for my business.
I love LTD's as long as the company isn't creating a long-term problem for themselves that isn't sustainable. For example, offering unlimited features that cannot be sustained over the life of the product. Then you lose and we lose.
If you set reasonable limits, your company can get a significant cash-infusion upfront, incredible user feedback that you can use to improve the product, as well as suggestions for features and integrations you may not have even thought of.
You can also collect great reviews and use them to promote your product further.
I've bought 26 LTD's so far and only had one case of a loss for me, where the company closed after 6 months. We as business owners can thrive off LTD's. I carry two monthly costs in my business (course platform/funnel software and ads). Everything else is covered by LTD's that I paid for once.
For you, an LTD gets your company moving forward without significant investment. Go one step further and setup an Affiliate/Partner Program and you can have your early-adopters who love your platform promoting it for you.
I see it as a Win/Win.