No, the defense does not rest. lol
Just looking right now, a Standard competitive deck is sub $500. There are Modern options for well....ok Modern looks like its extremely expensive right now, but there are budget options if you want to 'play'.
Or, you just go to a draft night, and play Limited.
Its all still 'Magic' after all, and you do not need (I did not for example) start with the most tricked out competitive deck in an expensive format.
You dont need that $1200 Modern deck, and you REALLY dont need that Legacy deck (UR Delver at over $4000...)
I dont eveen know how Vintage is played.