I don't see the economy factor. You get more feet per pound with Modern material, and use less feet per string.
10 strands of DF97 will easily handle a 60# bow.
From BYC site,
DynaFLIGHT 97 Bowstring The original high strength Dyneema® bowstring - 100% SK 75; very durable, low creep. Available in solid colors.
Recommended strands: 14-16, 26-28 on crossbows
Approx ft/lb waxed: 6700
Spool sizes: 1 lb, 1/4 lb, 1/8 lb
8190 Universal Bowstring
The toughest bowstring material ever made. Stability, speed, safety, durability, reliability. Available in solid colors.
•The lowest creep EVER in 100% Dyneema®
•The world's strongest H.M.P.E.
- Made from DSM's SK90 Dyneema®
•GORE® fiber added for even higher durability
•Smaller diameter strand for highest speed.
24 strands = 18 of 8125.
Recommended strands: 24/26
Approx ft/lb waxed: 9,500
Spool sizes: 1/8, 1/4 and 1lb
8125G Bowstring
92% SK75 Dyneema®, 8% GORETM fiber. Highest speed and higher durability; preferred by some compound shooters - particularly 3D. Also the choice of Olympic style recurve shooters. Available in all colors except Camo, Autumn and Flame.
Recommended strands: 18
Approx ft/lb waxed: 8200
Spool sizes: 1 lb, 1/4 lb, 1/8 lb
B500 Bowstring
Made from polyester material like the original Dacron; the ideal product for traditional archers. Also used on older crossbows. Available in solid colors.
Recommended strands: 12-16, 22-26 on crossbows
Approx ft/lb waxed: 4300
Spool sizes: 1 lb, 1/4 lb
B55 Bowstring
100% polyester similar to Dacron but with better durability and very low stretch. Available in solid colors.
Recommended strands: 12-16 for recurves, 22-26 for older crossbows
Approx ft/lb waxed: 4300
Spool sizes: 1 lb, 1/4 lb