Think 5 grand is a lot? for a hobby?
It ain't.
Relative costs of my 'hobbies'
Shooting: great hobby. one of those 'indespensible skills'. Also hugely interesting for a history buff.. a great hobby for someone who has some mechanical smarts and is good with thier hands since every weapon can use a bit of 'smithing' to improve some aspect of it's character. And like most hobbies, it converts money into a skill. Assuming a normal 'arsenal' and about 5,000 rounds of ammo a year and range fees.. a cool 5 grand to get yer skills up to 'expert'.
Model Aviation: A great 'american pastime'. Lots of winter evenings on the building benches; lots of beautiful days down at the flying field tooling around the sky with your awsome model airplane. Like most of the 'great' hobbies.. a similar 'great' investment in time and cold hard cash. To get to the point of being rated a 'decent' pilot and obtaining expert building skills.. at LEAST 5 grand, and probably double that.
Ham Radio: An interesting world filled with amazing science fiction gadgetry and incredibly arrogant and miserable old salamanders crouched over thier 90 year old morse code keys. Hugely interesting capabilities, concepts and technology, large learning curve. But.. talking to the Astronauts direct, bouncing signals off of passing meteors, raising Auckland on the HF.. hey; that's cool. About 1 to 2 grand builds up a good 'shack' and the stuff you learn might save somebodys life.. like your familys in a natural disaster.
Sailing: A boat is a hole in the water into which one pours money. But, the skills learned are classed right up there with the other 'fine arts' like flying and shooting.. and again; the skill set you obtain can and probably will save some lives. You learn about weather on a personal level, how to tie some dandy knots, and you get to talk like a pirate. You become a 'skilled' at about 5 grand invested. Hopefully.
I'll let the other guys fill yah in on some of the other hobbies like motorcycles, skiing, surfing, etc... suffice to say that 5 grand to 'get in' is cheap for a skillset like flying... and it IS a hugely fun and rewarding pastime, worth every nickel invested every time you do it.
Charge ahead.. DO IT!