Increased liabilities will add a little to the cost of marine insurance but commercial vessels insured in mutual protection and indemnity associations will probably see no substantive increase in insurance rates because coverage already provided by mutual associations is unlimited.
Unlimited marine insurance has a high cost differential to the price of a policy for individual commercial vessels. 
The price is not actually listed and can't be compared with the limited evidence. 
( z0 differ :ARG1 ( z1 cost :ARG1-of ( z2 high ) ) :ARG3 ( z3 insure :ARG1 ( z4 marine ) :ARG1-of ( z5 limit :polarity - ) ) :ARG3 ( z6 price :ARG1 ( z7 policy :beneficiary ( z8 vessel :mod ( z9 commerce ) :mod ( z10 individual ) ) ) ) )
(z0 / differ-02
    :ARG1 (z1 / cost-01
              :ARG1-of (z2 / high-02))
    :ARG3 (z3 / insure-02
              :ARG1 (z4 / marine)
              :ARG1-of (z5 / limit-01
                           :polarity -))
    :ARG3 (z6 / price-01
              :ARG1 (z7 / policy
                        :beneficiary (z8 / vessel
                                         :mod (z9 / commerce)
                                         :mod (z10 / individual)))))
Unlimited marine insurance has a high cost differential to the price of a policy for individual commercial vessels .
z3 :ARG1 z4
z3 :ARG1-of z5
z1 :ARG1-of z2
z0 :ARG1 z1
z0 :ARG3 z3
z0 :ARG3 z6
z6 :ARG1 z7
z8 :mod z9
z8 :mod z10
z7 :beneficiary z8
z5 :polarity 0