i think approaching the vendor directly is a bad idea. the auctioneer will still be paid and they might hold your "deviousness" against you
Apart from that, if you appear too keen it definitely counts against you and approaching the vendor directly puts you at an instant disadvantage.
I put in a bid on an investment property not too long ago which i had thought was out of my price range but i knew had been for sale for quite a while. i had looked at cheaper properties in the area but previously discounted this one as it was much newer and in better condition than the surrounding properties and accordingly the asking price (which i thought was very fair) was 25% more than others for sale on the road. The other properties would have needed a lot spent on them to bring them up to scratch whereas this one was almost new. although i had not even viewed the property internally or discussed it with the auctioneer, i rang them up and put in an arm-chancing starting bid 30% under the asking price in the assumption that it would be rejected. i nearly fell off my chair when the auctioneer rang me back to say the offer had been accepted.
the points here are that
1 the property was not shifting.
2 asking prices are plucked out of thin air
3 i played it cool when putting in my offer and said to the auctioneer that i was thinking about buying a property in the area and would buy that one if they would sell it for x but if not , there were plenty more fish etc
4 i had bought from the auctioneer before so he knew i was not a timewaster.
5 as i had not viewed the property, i gave the auctioneer no insight into my budget or motivation.
i was very lucky as the only reason i did it this way was that i genuinely thought i couldnt get it for what i wanted to spend and only actually put in the bid as i was frustrated by the state of some of the properties i had looked at and thought, what the hell- ive nothing to loose.
next time however, i will definitely do it the same way. the only thing is, you have to be prepared to walk away. A bidding war is absolutely the last situation you want to find yourself in.
if i was you,heres how i'd do it
i would get a trusted friend to view the property and if you are interested, they should criticize it (too - dear,small,big,old,new,damp,cold,far away, near) etc to the auctioneer and then walk away . they should also maybe make arrangements to view another property or 2 as well so noone gets suspicious.
contact the auctioneer and make an offer of what you would like to pay, but dont give anything away about your personal circumstances. definitely do not call in to their offices just ring and say you are familiar with the property but are also putting in some other bids on other properties with other auctioneers . rather than putting a time limit on it, say that the bid stands until one of your offers are accepted. that will put them under pressure, not you and create the illusion that you could disappear if they dont accept.
then wait and hope.
just remember that most auctioneers just want a property off their books and 20-30k makes no difference to their 1.5% commission.
The idea of them acting for vendors is just an illusion.