Is each card equally likely to be a Maverick?
Due to the low occurrence rates of mavericks it's impossible to state conclusively;
but, based on available data of registered decks, mavericks have a similar rarity curve to their non-maverick counterparts (8ishC:3U:1R:0S),
with the exception for some cards that specifically reference their own house (e.g. Wardrummer).

In total just over 4% of decks have at least a single maverick, and no decks have more than 3.