Online Travel Booking and Bidding Agencies - Consolidator Fare vs. ITA Software fares

I'm want to buy 4 tix for travel to Pakistan in December. Consolidators are selling them for ~$1550. When i look on ITA Software for published fares, I can get a fare of $1380.

Any risks booking a ticket like this? Will most travel agents do this kind of booking? Here's the booking details from ITA Software's engine:

Fare (A1): UA SFOLON WKXSNG1E fare $218.00
Fare (B1): BA LONDXB KHPXGB fare $384.97
Fare (C1): EK DXBKHI VLE4MAE1 fare $86.68
Fare (C2): EK KHIDXB VLE4MAE1 fare $86.68
Fare (B2): BA DXBLON VHAPGB fare $302.51
Fare (A2): UA LONSFO WKXSNG1E fare $218.00
Tax: USDA APHIS Fee $3.10
Tax: US Immigration Fee $7.00
Tax: US Customs Fee $5.00
Tax: US International Arrival Tax $13.40
Tax: Pakistani Embarkation Fee PKR 400
Tax: United Kingdom Passenger Service Charge £18.60
Tax: US International Departure Tax $13.40
Tax: US Passenger Facility Charge $4.50

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Total for 1 adult passenger: $1379.92
(as of Thursday, August 28, 2003 2:00am)

ITA Software does not sell airline tickets. You need to price your routing from a source that does. ITA Software has been known to display non-valid fares.