Only difference is lump vs recurring I think
If I give you say 100 EUR tomorrow I don’t have trouble with making this work with my cash flow over time (similar to ER Bxl crew, community members often want to keep recurring costs of the book I think). Also, our style is decidedly non-linear I’d say. We don’t visit for 5 days every year, for the next 20 years. We visit once for 2-3 nights and discuss things. Then if things start working out we come again for a week. Then the same next month. Then we see, fuckit, it is easier to straight up move to Bxl.
Or we bring an acquaintance for a 3-way discussion and a short holiday meet-up. And on the last day they decide that some ER project is what they really want to do, and never go back home. As crazy as it may sound, but those are the more plausible models from my perspective.
Also, if you have 100 EUR tomorrow - those can go to work for making the place a desirable destination straight away. If the users come before the cash it is the wrong way around. In-kind contributers are usually a different story - there it may be better if they first get to experience what you actually need and can thus contribute more efficiently and effectively.