With Xojo, the IDE will do the indentation for you, so neither spaces nor tabs needed. What influence might that have on our income? 
Developers Who Use Spaces Make More Money Than Those Who Use Tabs
Did you have a look at the raw to check the confidence levels?
Tab users may deliver a better application in term of User Interface / (small) amount of bugs, more usefull features, etc. and this takes a bit more time to achive, thus less salary ?
Also, Xojo does not allows us to replace spaces with Tabs (in code source).
Sometimes, the truth is elsewhere.