I think LandDAO has good reasons for not accepting payment in installments because if clients are unable to meet the payments, it may have its own effects. However, in researching LandDAO, I found that one of their benefits is to make buying land easy. This led me to consider the idea of installment payments, which common people could also benefit from. But since they have mentioned no installment payments, perhaps LandDAO sells their land at affordable prices, as this may be the only way for everyone to buy land easily from them.
For LandDAO to accept moderate payment, it shows that the team has us in mind so that buying lands will be as easy as possible. A project that cares about her community will do something like this so that every investors will have the chance to invest what they can without much pressure about not been able to get the kind of land purchase they are interested in.
Cryptocurrency investment should not be something that majority of investors can't afford since everyone has what they can afford and what they can't. The LandDAO team has make the processes of acquiring land to be so easy that we don't have to be scared of land grabbers or anything that will lead to lose of properties.