A ParseHub analysis of 1,000 Pokmon cards listed on eBay found that the cheapest cards are sold for just $1.29, and the average card sells for $20.19
For perspective, an unsigned PSA 10 copy had sold for $50,000 on eBay
You can reduce your opponents Life Points to 0 with monster attacks and/or effect damage, force your opponent to deck out, and you can even win if your opponent runs out of time (if a turn timer is imposed)
Graded Card Premiums Where the Shiny Charizard EX SIR becomes genuinely interesting as an investment is in graded form
Mewtwo #10 (Pokemon Base Set | Pokemon Cards) prices are based on the historic sales
Bolt was not the best card in the world in this format, but it was still highly relevant and very strong