I tend to think of it the same way as you to Peter, long term "investing". Where I live in Melbourne there is no space to put in any kind of observatory and while I do have a 10 acre property in Heathcote I've still got quite some time before I want a fully automated place to deal with
Besides all that, looking at either buying or building a place later this near and need that all painful deposit.
I imaging this is the kind of issue that many run into. Renters will most likely never be able to put down the footing for an observatory and buying an observatory eats into any kind of deposit.