Still Worth It To Buy Key Date Coins?

100% It's always best to buy the keys first and then the commons. Yes, they will cost you alot more this way, but you will gain a larger return and they will be more liquid than a bunch of common morgans. This example isn't 100% accurate but this will give you a good idea: 1916-D Merc dime 1999 RedBook value in VF20 $1600 ebay 1916-D VF DETAILS merc $3500.

Just because you could name your price for a coin doesn't mean it's going to sell if the buyer doesn't want to pay for it.

It could happen. There's been a lot of hype and resulting volatility with anything perceived as an "investment".

Checking price trends, I've noticed key Lincolns in recent years have been hotter than long-term. Probably other coin series have performed the same. Personally, I'd skip coins in grades that are hyped as "investments", and pick a series that interests you in below-MS grades. The first thing you might buy are a few good books to research the series in detail. The more you know, the less likely you'll be taken by forgeries, and you might even spot some rare coins others miss!

I would recommend loading up on Jefferson key dates (the big 5- 38D, 38S, 39D, 39D, 50D) which are very attractively priced right now. They may stay stagnant for a few more years, but they almost have to start climbing, especially since you can hardly ever find any of these in circulation.

Other keys to consider: most of the Lincoln wheat semi-keys are affordable.

I think the two Washington quarter keys, 32D and 32S are very low for their mintage and increased degree of collector interest in the Washington series (due to Statehood Quarters).

Lower mintage FDR silver dimes I think are attractive, like 49S, 55.

The Franklin half series is also a sleeper- you can usually buy a circulated complete set for just over buillion, despite there being a number of low mintage coins in the series. If you buy a few circulated sets, you are bound to get a few nicer pieces and can keep one nicer set and sell the remainder.

I should also add Buffalo nickels- 26S and 31S in lower grades are very affordable and they are among the lowest mintage of the series. 26S is already seeing upward movement. I see a lot of insanely high prices on ebay for mid to upper grade 26S coins. So maybe go after the G/VG grades for both 26S and 31S.

do like I am doing buy as much of the 1933 d pennies as you can find this is a very cheap coin even in bu .and that is like 100 per each onethis coin should be at less 10.00 in good it only 3.25 and this one coin dealer is hording the 1938 d buff.it cheap also. any thing below 1940 in pennies is red bu should be bought up they are still super cheap.

What are the ones that are most often forged? And will some dishonest dealers still try to sell them?

Given that keys tend to appreciate in value at a higher rate than the common dates, yes, I'd say that in the long run you'd save money.