If it was brought back to Scandinavia, did the influx of loot have any impact on the economy of the region? Perhaps encouraging more trade?
It certainly did. I recently finished my masters on these lovely individuals and while I do not have all the sources handy with me, hopefully, someone else here will.
To give you a brief, non-cited explanation, there were several places that the loot from Viking raids/expeditions had a serious effect. Towns like Dublin were completely established by Viking raiders and therefore would have been affected greatly by the influx of coinage. In addition to that, those Vikings that served in the Varangian Guard and returned to Iceland often did so as rich men. I believe there is a man named Bolli Bollason (or something similar), who serves for a time in the Varangian guard, then returns and is so wealthy he is known as Bolli the Grand.
As far as the division of loot goes that is a much harder and less studied question. There are no primary sources that give us a percentage break-down of what a raiding band would receive. Often, all we have is that the entire force was paid x pounds of silver and other such goods. In order to really find out something about how much the average Viking warrior took home would require examining graves. Even then though, it would only be a rough estimate of how much a raider could obtain over time and not be an accurate reflection of how much a particular raid earned them.
I can promise you though, it is very unlikely that only one man received the loot, and even if he did, he soon split it up amongst his men or else paid the price. Gift giving was extremely important and played a massive role in keeping together raiding parties.
tldr: very much yes.