I've been watching the development of bitcoin for a while. When I first heard about Bitcoin, I was already late, the price was $200 per Bitcoin. People who had bought bit coin for $10 or $20 dollars the year before were already well off. I bought some and started trading.
There was a coin market by some fat cac who was really into Japanese culture and moved the largest Bitcoin marketplace to Japan.
Long story short, those days Bitcoin was still very unstable but the price had jumped way above $400 dollars (you were late again to the market at above $400).
That marketplace that I mentioned called Mt.Gox collapsed because their Fat CEO was stupid and a thief, so the price of Bitcoin took a nose dive and was kind dead for a bit. I basically stopped investing in Bitcoin for long term and just started buying and trading Bitcoin and alt coins for different people for a fee. I've done several hundred trades for people looking to buy bitcoins or any alt coins with cash, card , etc.,.
First time I heard about pumping and dumping was with Maxcoin. The coin was lunatic Max Kaiser's (and Alex Jones sort of) entry into the cryptocoins. The coin was total Shyte and a scam, but he launched a marketplace to buy the coin and that market place had admins who would pump and dump different coins in a chat room that anyone could enter who owned max coins and had a account on the marketplace site.
I followed a few 'whales' on twitter who would community pump and dump several coins and I never got rich doing it (never invested too much because of risk) but I made enough to buy extra stuff and take several trips. I've always held some alt coins and some bitcoins, but there is still a lot of risk to it if you are not careful..
I had several bitcoins and some alt coins on a coin market place called Cryptsy.com and the owner basically emptied everyone's account and split to South America, he is still wanted, but most were not able to recover their claims if you didn't have detailed screenshots and logs of your account activities and totals on the website since the owner burned all the records of accounting and memebership.
I don't really invest in coins for the long haul anymore. I missed out on dogecoin raise and aurura coins rise and those 2 always haunt me.
I do try to ride the occasional pump when If I get info about it, but you need a large community or big pockets to create your own pumps. I do buy and sell alt coins and bitcoins for people who don't want the headache or are new for a small transaction fee, which is usually a few dollars per trade.