My question to you guys is this, what negotiation tactics can I use to make these guys realize that their prices are much to high and  unrealistic? 

But Id imagine it would be a good tactic for a dilapidated property, or creative fix-flip Would you ever do it again?

Many of them use scare tactics.

Or that if you tried another tactic, consistent tactics and/or go down the path of the legal process (possibly in tandem) they wouldn't respond.

.……………………….. 337Competitor Disinformation Tactics………………….………………… 337Be Careful of "Experts"………………….……………………………. 338Who Should You Listen to………………….…………………………. 339Specialize Only to a Point………………….………………………….. 339Weeds in Your Business Garden………………….…………………… 340Develop Problem Solving Mentality…………………………………... 341Exploit Your Unique Business Advantage……………………………. 342Competitor Surveillance………………….…………………………… 343Join Associations………………….…………………………………… 344Use Systems, Policies, Checklists, Forms…………………………….. 345Chapter 17 Select the Right Business Form………………………. 347The Four Main Structures………………….………………………….. 347What is the Best Entity Choice………………….…………………….. 350Create a Fictitious Name………………….…………………………… 350Landlording and Entities………………….…………………………… 351Chapter 18 Shrewd Marketing Secrets………………….………... 352Marketing Rules #1, #2………………….

However, given that I am a novice investor, this tactic puts too much emphasis on my limited experience and related skill in property investing.

The few wholesalers I have come across have used deceptive tactics when dealing with the seller by often deceiving the seller into thinking they are going to buy a property when they don't even have the money to afford it.

REIAs and other real estate groups are good to take the training and tactics one receives here on Bigger Pockets and help you apply it to your local market (and NY has quite a few quirks).

Another fraud tactic is that someone can copy your listings, make themselves look your site, (I've seen it happen with the HomeAway website!)

Despite landlord rights to enter with proper notice, most existing tenants do NOT want people in & out of their home while trying to pack and get ready to move.Understandable as many of their personal items may be out in the open.Tenants can sabotage efforts to show their home:1) Leave the place a mess show it shows poorly2) Speak ill of the landlord to prospects3) Change the locks4) Leave a minor home alone5) Leave an aggressive dog in the home6) Make threats to physically harm agentsOf course, you can try various tactics to overcome these, but for an agent, it's just not worth it!