Also, dont be too hard on yourself, Sellers remorse?

are you a danged hippy or something and feel that macrame necklace you spent a week making isnt worth 20 dollars? Perhaps you would feel more comfortable with the Minelab tribe? Those guys will buy anything as long as it says Minelab!
At least you SOLD it to your Brother, and he didnt just take it or steal it from you. Which leads me to believe you are the Older brother,

If so, its incumbent upon you to teach your youngers about what a good freakin' looks like, so they dont marry wrong, buy crappy cars off Craigslist, etc. Besides, from the sounds of it, he probably needed a good freakin'...So as an older Brother, well versed in Freakin' my youngers, heres my advice,...
Tell him the F70 is hot as hell and twice the rig of the Tejon! (which is probably true in a sense.

)...then, act like you let him get you drunk, (on beer he bought) and 'trade' the 70 to him for the Tejon plus cash! Act like you are doing him a favor, are ignorant, drunk, got into some gambling trouble, need the money, are twice as dumb as he is, (most likely!) whatever! etc.

Tell him the 70 hits gold and silver so hard, it puts dents in it!....See? Its all about marketing and can be a win-win for everybody!
You get your Tejon back plus cash, and beer, and he gets to dialog with ME up on the Fisher Forum about the F70! Talk about a good old fashioned FREAKIN'! That poor bastard wont know what hit him after I have a go! He will think he's on the Waffle House menu once I get done slathering, scattering, smothering, and covering his huevos, about threshold, tones, notch, disc, proportional modulated audio and all...! I'll give him the good old Aunt Jemima treatment for you, and spatula slap the flapjacks outta that SOB! That way, you can go about acting all innocent and let me do the dirty work! Whaddaya Say? Oh, by the way, I have a magic Genie coin and some magic beans for sale down on the accessory Forum you might be interested in if you brother falls for this! Its sort of like an extended warrantee, or undercoating, what we call 'upselling' to a hot mark with dough!

that said, I'll trade you a used Cobra Beach Magnet for that damned F70 of yours...maybe even toss in an Fpoint to make it even..

.
Mud
( you put down a real funny post, and this is of course an attempt at carrying some humor through the day!) Not intended to offend anybody, well, except maybe the Minelab guys...those snooty sumguns and their 'multi freq' top of the line imported gear!) seems a fellow needs to drive a Rolls Royce to even get into their Country Club as a caddy!