1) Amasser 2) Investor 3) Miser 4) Niggard 5) Packrat 6) Scrooge 7) Skinflint 1) Big saver 2) Compulsive collector 3) Greedy guy 4) Miserly sort 5) More than a pack rat 6) Obsessive collector 7) Pack rat 8) Packrat 9) Saver 10) Selfish one; magpie 11) Sub rosa collector 12) Treasure stasher 
• (n.) One who hoards.
Hoard'er noun One who hoards. 
Someone who buys toys with an intent to resell. Will buy as many of a single figure as they can find, squirrelling them away in the hopes that their value will increase. This buying practice can create a local shortage, and therefore the desired price increase. Most damaging to the collector market in the long term.
[n] - a person who accumulates things and hides them away for future use